Telephone-transmitter



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F. U. WAT-KINS.

TELEPHONE TRANSMITTER. No. 355,426. l Patnted Jan. 4, 1887.

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TBLBPHUNB TRANSMITTER.

No. 355,426. Patented Jamil, 1887.

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F. G. WATKINS. TELEPHONE TRANSMITTER.

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UNITED STATES PATENTN OFFICE. Y

FRANK C. VVATKIN S, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE UNITED STATES KROTOPHONE COMPANY,

OF NEW YORK, N. Y.

^ TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 355,4276, ated January 4, 1887.

Application filed April 2.7, 1886.

To all whom, it may concern:

Be it known that I, FRANK C. WATKINs, a citizen of the United States, residing at Philadelphia, in the county of Philadelpia and State of Pennsylvania, have invented certain new and useful Improvements in Telephone-Transmitters; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art 1o to which it appertains to make and se the same, reference being had to the accompanying drawings, and to the letters and gnres of referencemarked thereon, which form a part of this specification.

My invention has 'relation to av telephonetransmitter of peculiar construction, and I have shown it in connection with a telephone of that class wherein` the receiver is detachably secured to the transmitter when not in zo use, and removed therefrom when about to operate, whereby when not in use the battery, transmitter, and receiver are cut out, so that the line runs only through the callbell tothe ground, and when the receiver is detached from the transmitter the call is cutout and the line runs through the secondary'circuit of thetransmitter, thence through the receiver to the ground, and at the same time the pri-` mary circuit is closed in the transmitter; and

y the object of the invention is Vto simplify telephonic communication, so that all the subscriber has to do is to detach his receiver from the transmitter when he desires to talk, and' to replace it when he is through; and the novelty consists in a transmitter of novel construction, as will be hereinafter more fully described, and particularly pointed out in the claim. c

In the accompanying drawings the same letters of reference indicate the same parts of the invention.

Figure l is a perspective View of my trans- Y mitter and receiver as they appear when not in use. Figs. 2and 3 are similar views show- 4 5 ing the receiver detached from the transmitter when in use. Fig. 4 is a rear elevation of the transmitter, showing the position of the Serial No. 200,373. (No model.)

switches when the receiver is in place. Fig.

5 is a vertical section of the transmitter. Fig.

6 is a detached view of the diaphragm and 5o carbon electrode and manner of mounting the same. Fig. 7 is a modification of the manner of mounting the electrode.

A is the transmitter-case, and B the receiver, the two being connected by a flexible conducting-cord, C, containing two or more conductors, thepcord shown in the present case being composed of four conductors to correspond to the peculiar form of transmitter used.'

The transmittercase A is provided with a 6o central cylindrical shell, 2,;into which the receiverV is inserted when not in use, and in the center of this shell is .an orifice, 3, through which the voice reaches the diaphragm. The

back-of the diaphragm 12 is provided with a 65 platinum button, 4, and against this button rests the oblique-beveled'end of the carbon eleetrodec, it being supported in a metallic sleeve, 6, provided with an arm, 7, by means of which it is hinged to the depending 7o bracket 8, secured to the interior case, A.

The set-screw 9 in the sleeve 6 permits an easy adjustment of the electrode 5 with reference to its lengt-h, and at the same time insures an electrical connection, and the adjustment of the gravity ot' theelectrode is provided for by means of the set-screw 10, the head 11 of which is accessible from the front of the transmitter. Y

Having thus described my invention, what I 8o claim is Y n 4The combination, with the diaphragm l2, having platina button 4, of the carbon electrode 5, mounted in sleeve 6, provided with arm 7 suspended from the bracket 8, the lat- 85 ter being adjustable by the screw 10, whereby the gravity of the electrode will be variedwith reference to the diaphragm, as set forth.

In testimony whereofI affix my signature in presence of two witnesses.

FRANK C. VATKINS.

Witnesses:

H. J ENNIs, JN0. N. OLIVEE. 

